Spotify - Map shows when two people play same song at same time
Hunter - Find all the email addresses related to a domain
Last.fm - The world's largest online music service. Listen online, find out more about your favourite artists, and get music recommendations, only at Last.fm
AnyMailFinder.com - Find anyone's email address
SoundCloud - Enjoy music & follow favourite artists
EmailMatcher - Find anyone's email address in a matter of seconds, for free